I have reviewed the document and I believe it is ready.

I only found one minor nit when reviewing.

In section 2 it says:
   As specified in section 2.4.4.2 of [I-D.ietf-idr-sr-policy-safi], the
   Segment Type Sub-TLVs specified in this document are also used only
   by the SRPM [I-D.ietf-idr-sr-policy-safi] as described in section 4
   of [RFC9256] on the same lines as segment types A and B.  Their
   validation is, therefore, beyond the scope of BGP.

SRPM should be spelled out when first used.
Not sure what is meant by "on the same lines", should it be "along the same lines"?